All About United States Minor Outlying Islands: Check History, Geography and Interesting Facts

Aug 27, 2025, 03:48 EDT

The U.S. Minor Outlying Islands are nine remote, unincorporated territories in the Pacific and Caribbean, valued for their ecological, historical, and strategic importance. Claimed under the 19th-century Guano Islands Act, islands like Midway Atoll and Wake Island played significant roles in World War II. Today, most serve as wildlife refuges, protecting rare species and coral reef ecosystems, managed by federal agencies like the U.S. Fish and Wildlife Service, highlighting their conservation value despite being largely uninhabited.

All About United States Minor Outlying Islands
All About United States Minor Outlying Islands

The U.S. Minor Outlying Islands are a group of nine very remote, unincorporated territories straddling the Pacific Ocean and the Caribbean Sea. While many people do not think of them this way, these small islands deserve attention because of their ecological, historical, and strategic significance. The bulk of these islands were taken under sovereign claim by the U.S. in the 19th century under the Guano Islands Act. Later, the islands played pivotal roles in World War II, especially Midway Atoll and Wake Island. 

Currently, many of the islands have been declared wildlife refuges to protect the rare species, including coral reef ecosystems. While the federal agencies like the U.S. Fish and Wildlife Service holds the management authority over most of the islands, the areas remain mostly free from human development and therefore important when thinking about different parts of U.S. history, and the value of these islands as a platform for ecological conservation (or scientific research) and national defense, considering some of the worlds most isolated places.

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History of the United States Minor Outlying Islands

The United States Minor Outlying Islands are linked to resource extraction, military doctrine, and conservation. They were primarily claimed by the United States during the middle of the 1800s, under the Guano Islands Act, which enabled the U.S. to acquire islands with guano found on them. During World War II, several of these islands, most importantly Midway Atoll and Wake Island, became important military bases. 

Midway is the site of a significant U.S. victory in the war, while Wake Island experienced some of the fiercest fighting of the war. After the war, several of these islands were still used for weapons testing, while other islands were used for other military operations like Johnston Atoll, which was used for chemical weapons disposal.

 Over time, the strategic significance of these islands began to diminish, and many were turned over to conservation organizations. Today, the majority of these islands are now either National Wildlife Refuges or part of the Pacific Remote Islands Marine National Monument, which is protecting sites with rare species and ecosystems. The islands, despite being uninhabited, still have significance from their military history as well as ecological conservation significance.

Geography of the United States Minor Outlying Islands

The United States Minor Outlying Islands are nine island territories located in the Pacific Ocean and the Caribbean Sea. The islands are considered unincorporated, unorganized territories of the United States, which means that they are under control of the federal government, have no permanent population, and have no locally developed government.

Pacific Islands:

  1. Baker Island

  2. Howland Island

  3. Jarvis Island

  4. Johnston Atoll

  5. Kingman Reef

  6. Midway Atoll

  7. Palmyra Atoll

  8. Wake Island

Caribbean Island:

  1. Navassa Island

These islands vary in size, with most being small coral atolls or reefs. Many are low-lying, with little vegetation, and surrounded by coral reefs or shallow lagoons.

Interesting Facts About the United States Minor Outlying Islands

Here are some interesting facts about the United States Minor Outlying Islands:

1. No Permanent Inhabitants

 None of the islands has a permanent civilian population; any personnel who may be present are only temporary personnel (scientists, conservationists, or military personnel).

2. Claimed for Guano

 Due to the value of guano (bird droppings) as fertilizer, the majority of the islands were claimed under the Guano Islands Act of 1856, 

3. Significance during World War II

 Wake Island and Midway Atoll were instrumental as military bases during World War II. Midway was the site of a large naval victory for the United States in 1942.

4. Huge Wildlife Sanctuaries

 Many of the islands fall under the auspices of the Pacific Remote Islands Marine National Monument, which protects rare birds, sea turtles, and untouched coral reefs.

5. Interesting Time Zones

Some of the islands, such as Wake Island, are among the last places on earth to experience each calendar day because of their proximity to the International Date Line.


Ayukta Zisha
Ayukta Zisha

Content Writer

    Ayukta Zisha is a Content Writer and Published Author with a Master’s degree in English Literature. She also holds a certification in Digital Marketing from IIT Delhi. Deeply passionate about art, aesthetics, and literature, Ayukta brings a unique creative flair to her writing. A dedicated bibliophile, she continues to explore and share her love for words through engaging and insightful content. You can reach out to her at ayukta.zisha@jagrannewmedia.com

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